1444001540 has 24 divisors (see below), whose sum is σ = 3038599872. Its totient is φ = 576420320.

The previous prime is 1444001521. The next prime is 1444001563. The reversal of 1444001540 is 451004441.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63704 + ... + 83343.

It is an arithmetic number, because the mean of its divisors is an integer number (126608328).

Almost surely, 2^1444001540 is an apocalyptic number.

1444001540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1444001540 is an abundant number, since it is smaller than the sum of its proper divisors (1594598332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1444001540 is a wasteful number, since it uses less digits than its factorization.

1444001540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147547 (or 147545 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1444001540 is about 38000.0202631525. The cubic root of 1444001540 is about 1130.2882654025.

Adding to 1444001540 its reverse (451004441), we get a palindrome (1895005981).

The spelling of 1444001540 in words is "one billion, four hundred forty-four million, one thousand, five hundred forty".